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MAINTENANCE MANUAL
2) The leading edge surfaces must have no ice, snow or frost on them. Examine the areas between the surfaces that move and the surfaces that do not move to make sure there is no ice.
3) The right and left sides of the horizontal stabilizer must get the same and full ice removal/anti-icing procedures.
Fuselage and Vertical Tail Surfaces
CAUTION:_______ BE CAREFUL WHEN YOU REMOVE ICE AND SNOW FROM THE
FUSELAGE AREA WHERE THERE ARE LIGHTS AND ANTENNA. IF
YOU ARE NOT CAREFUL, YOU CAN CAUSE DAMAGE TO THE
EQUIPMENT.
1) The fuselage and the vertical tail surfaces must have no ice or snow on them. This will decrease the aerodynamic drag and the weight of the airplane.
NOTE: Thin hoar frost is permitted on the top surface of
____ the fuselage if all the vents and ports are clear. Thin hoar frost is a white layer of constant thickness with a sharp crystalline texture. It usually occurs on surfaces that are out on a cold night with no clouds. Hoar frost is thin. You can see items on the surface below the layer of frost, such as paint lines, marks or letters.
2) Remove all of the snow from the nose radome area. If you do not do this, the snow will blow aft and decrease the pilots' vision on the takeoff.
3) Do not apply hot deicing fluid or hot water directly on the pilots' windshield or the passenger windows. You can let the fluid flow on the windows after you apply it to the top of the cabin. This is permitted since the fluid will be cool when it gets to the windows.
4) All of the deicing/anti-icing fluid on the cockpit windows must be removed before the departure. Carefully examine the windows with the wipers installed. Also, examine the forward areas where the fluid can flow aft on the windshields during the taxi and takeoff. These areas must be clear before the departure.
Engines and APU
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MAINTENANCE MANUAL
WARNING: PERSONS MUST STAY CLEAR OF THE DANGEROUS AREAS IN
_______ FRONT OF OR IN BACK OF AN ENGINE (REF 71-00-00) AND IN THE APU EXHAUST (CHAPTER 49) WHEN THEY OPERATE. INJURY OR DEATH OF PERSONS CAN OCCUR IN THESE AREAS.
1) For the safety of persons, do not operate the engines or the APU during the ice removal/anti-icing operations. But, if it is necessary to do the ice removal/anti-icing procedure during engine and/or APU operation, do the steps that follow: a) Make sure the engine and/or the APU is at idle speed b) Do not point the spray of deicing/anti-icing fluids
directly into the engine and/or APU inlet.
CAUTION: MAKE SURE THE APU INLET AREA IS CLEAR BEFORE YOU
_______ START THE APU. THE APU CAN BE DAMAGED BY THE ICE OR SNOW THAT COLLECTED IN THE INLET AREA.
2) If the engines/APU are on, do the steps that follow: a) Close the valves for the air conditioning pack to the cabin. b) Close the shutoff valves for the APU air supply.
3) This will keep the fumes out of the cabin when you apply deicing/anti-icing fluid in the area of the engines/APU inlets.
4) Turn the bleed air switches for the APU/Engine to OFF before you do the ice removal procedure. When the ice is removed, let the vapors decrease to zero before you put the bleed air switches to ON.
5) Do not point a spray of deicing/anti-icing fluid directly into the areas below: a) The inlet ducts for the engine or APU b) Exhausts c) Engine thrust reversers d) Engine inlet e) Probes attached to the strut f) Engine bleed air ducts.
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